This is how it looks with complexity 2. Not entirely smooth but enough for what I needed it for. I only used complexity 4 for close-ups. 8 is an overkill. imho. 40 sounds redundant save for the most extreme cases. Complexity is a simple multiplier, nothing else. At 2, it generate 18 meshes, at 4 you get 36.
Again, this will depend on your mesh. This is what I’m using, the material is very simple and just uses pixel depth to avoid clutter when you have 20+ objects visible.
I’ve yet to dip below 119fps with 25 actors. stock 7970 + 3570k@4GHz.